revenue to the state in the 6th century B.C. The fact that they were all supposed to be scions of the sacred olive-tree on the Acropolis, which was itself supposed to be the gift of Athena, and the religious care bestowed on them, puts it beyond doubt that the olive at an early date formed one of the most important products of Attica. The instances given already of the employment of various kinds of food as money are sufficient to show that there is nothing far-fetched in supposing that olives and olive-oil may have been so employed at Athens.
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Fig. 40. Tetradrachm of Athens.
We have already spoken of the silphium or laserpitium plant on the coins of Cyrene, Barca, Euesperides and Teuchira, and mentioned the interpretation which makes it the symbol of the hero Aristaeus. It seems however far more reasonable to treat it on the same principle as the others just discussed. The silphium formed the most important article produced in that region, and it is perfectly in accordance with all analogy that certain quantities of this plant and of the juice extracted from it should be employed as money. We saw above that at the present moment tea is so employed on the borders of Tibet and China, and raw cotton in Darfur. But there is also some positive evidence in favour of this assumption, for Strabo[1] tell us that a traffic was carried on at the port of Charax between the Carthaginians and Cyrenaeans, the former bringing wine wherewith to purchase the silphium of the latter. There must have been a wine-unit, and also an unit for the silphium, or otherwise the barter could not have been carried on; and just as in Gaul[2] a jar of wine purchased a boy fit to serve.]
